package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Author: Zjn ; Bring it on !!!
 * @Date: 2021/11/8 0008 14:32
 * Note:
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param){
        //1.动态构建出查询需要的DSL语句
        SearchResult result = null;

        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);


        try {
            //2.执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //3.分析响应数据封装成我们需要的格式
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return result;
    }

    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder source = new SearchSourceBuilder(); //构建DSL语句

        //1.构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1must
        if(StringUtils.hasLength(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2bool-filter
        //三级分类
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catelogId",param.getCatalog3Id()));
        }
        //品牌ID
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //所有指定属性
        if(param.getAttrs()!=null && param.getAttrs().size()>0){
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();

                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));

                //***每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }
        //库存是否有
        if(param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }
        //按照价格区间
        if(StringUtils.hasLength(param.getSkuPrice())){
            //1_500/_500/500_
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = param.getSkuPrice().split("_");
            if(s.length == 2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }

            boolQuery.filter(rangeQuery);
        }


        source.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1排序
        if(StringUtils.hasLength(param.getSort())){
            String sort = param.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            source.sort(s[0], order);
        }
        //2.2分页
        source.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        source.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3高亮
        if(StringUtils.hasLength(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");

            source.highlighter(builder);
        }


        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //1.1子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        source.aggregation(brand_agg);

        //2.分类聚合
        TermsAggregationBuilder catelog_agg = AggregationBuilders.terms("catelog_agg").field("catelogId").size(20);
        catelog_agg.subAggregation(AggregationBuilders.terms("catelog_name_agg").field("catelogName")).size(1);
        source.aggregation(catelog_agg);

        //3.属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg","attrs");

        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");

        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        attr_agg.subAggregation(attr_id_agg);
        source.aggregation(attr_agg);


//        String s = source.toString();
//        System.out.println("构建的DSL语句:"+s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, source);
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @param param
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        SearchHits hits = response.getHits();
        //1.返回所有查询到的商品
        ArrayList<SkuEsModel> skuEsModelList = new ArrayList<>();

        if(hits.getHits()!=null && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if(StringUtils.hasLength(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                skuEsModelList.add(skuEsModel);
            }
        }
        result.setProducts(skuEsModelList);

        //2.当前所有商品涉及到的所有属性
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        if(attr_id_agg!=null){
            for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
                SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
                //得到属性ID，名字，所有值
                String attrId = bucket.getKeyAsString();

                ParsedStringTerms attr_name_agg = bucket.getAggregations().get("attr_name_agg");
                String attrName = attr_name_agg.getBuckets().get(0).getKeyAsString();

                ParsedStringTerms attr_value_agg = bucket.getAggregations().get("attr_value_agg");
                List<String> attrValueList = attr_value_agg.getBuckets().stream().map(item -> {
                    String attrValue = item.getKeyAsString();
                    return attrValue;
                }).collect(Collectors.toList());


                attrVo.setAttrId(Long.parseLong(attrId));
                attrVo.setAttrName(attrName);
                attrVo.setAttrValue(attrValueList);

                attrVos.add(attrVo);
            }
        }

        result.setAttrs(attrVos);

        //3.当前所有商品涉及到的品牌属性
        ArrayList<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        if(brand_agg!=null) {
            for (Terms.Bucket bucket : brand_agg.getBuckets()) {
                SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
                //1.得到品牌ID,名称,图片
                String brandId = bucket.getKeyAsString();

                ParsedStringTerms brand_name_agg = bucket.getAggregations().get("brand_name_agg");
                String brandName = brand_name_agg.getBuckets().get(0).getKeyAsString();

                ParsedStringTerms brand_img_agg = bucket.getAggregations().get("brand_img_agg");
                String brandImg = brand_img_agg.getBuckets().get(0).getKeyAsString();


                brandVo.setBrandId(Long.parseLong(brandId));
                brandVo.setBrandName(brandName);
                brandVo.setBrandImg(brandImg);

                brandVos.add(brandVo);
            }
        }


        result.setBrands(brandVos);

        //4.当前所有商品涉及到的分类属性
        ParsedLongTerms catelog_agg = response.getAggregations().get("catelog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        if(catelog_agg!=null) {
            List<? extends Terms.Bucket> buckets = catelog_agg.getBuckets();
            for (Terms.Bucket bucket : buckets) {
                SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
                //得到分类ID
                String keyAsString = bucket.getKeyAsString();
                catalogVo.setCatalogId(Long.parseLong(keyAsString));

                //得到子聚合
                ParsedStringTerms catelog_name_agg = bucket.getAggregations().get("catelog_name_agg");
                String catelog_name = catelog_name_agg.getBuckets().get(0).getKeyAsString();
                catalogVo.setCatalogName(catelog_name);
                //汇总
                catalogVos.add(catalogVo);
            }
        }
        result.setCatalogs(catalogVos);


        //5.分页信息-页码-总记录数-总页码
        result.setPageNum(param.getPageNum());
        Long total = hits.getTotalHits().value;
        result.setTotal(total);

        int totalPages = (int) (total%EsConstant.PRODUCT_PAGESIZE==0
                        ?total/EsConstant.PRODUCT_PAGESIZE
                        :(total/EsConstant.PRODUCT_PAGESIZE+1));

        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6.构建面包屑导航功能
        if(param.getAttrs()!=null && param.getAttrs().size()>0) {

            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                //1.分析每个attrs传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //attrs=2_5寸:6存
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                Long attrId = Long.valueOf(s[0]);
                R r = productFeignService.info(attrId);
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }

                //2.取消了面包屑之后，我们要跳转到哪个地方,将请求地址的url里面的当前条件置空
                //拿到所有的查询条件，去掉当前
                String encode = null;
                try {
                    encode = URLEncoder.encode(attr, "UTF-8");
                    encode = encode.replace("+","%20");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                String replace = param.getQueryString().replace("&attrs=" + encode, "");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(navVos);
        }
        return result;
    }
}
